厦门光沃自动化设备有限公司

IC697ALG440

针对第三方物流仓储的作业特点及实际传输距离需要，横向比较几种无线传输方式后，选择基于ZigBee技术的无线自组网方案。ZigBee自组网是基于IEEE802.1 5.4的无线通信技术，由多到65 535个无线数传模块组成的高可靠性无线数传网络平台。在整个网络范围内，每个ZigBee数传模块问可相互通信，各节点间距离可以从标准的75 m无限扩展，具有使用方便、工作可靠、价格低的特点。

与其他组网方式相比，首先ZigBee技术采用的是自组网通信方式，每个ZigBee节点可独立工作，一旦某个节点出现问题，可通过其他节点传输数据，并可随时随地将新的RFID阅读器加入网络，不会影响全部网络的使用;若使用Wifi技术，某AP故障会导致覆盖范围下所有RFID读卡器无法实现数据交换其次，ZigBee协议栈简单，实现相对容易，运行ZigBee需要系统资源约28 Kb，而蓝牙协议栈相对复杂，需要系统资源约250 Kb;此外ZigBee比蓝牙更为灵活，更有利于控制系统成本。

在仓储作业中根据作业流程，需要大量数据传输节点，数量巨大的通信设备造价及在网运行时的通信费用，直接影响系统成本;而ZigB ee技术除了首批投资成本外不会产生更多的日常使用费用。虽然ZigBee的传输速率并不快(2.4 GHz的频段只有250 Kb/s)，然而考虑到仓储作业特点，货物托盘上的电子标签只写入货物的ID号，字节长度通常在32 B以内，因此不会对传输速率有过多影响，满足正常工作条件。且ZigBee的功耗较低，同样电源环境下，蓝牙和WIFI的持续工作时间要远远小于ZigBee。

RFID相关协议中只规定了通信接口，而ZigBee具有相对完善的通信组网协议，工作频段上ZigBee可以选择2.4 GHz ISM频段(全球通用频段)，而RFID可工作在915 MHz或其它频段，二者在通信频率上互不干扰。考虑仓库为室内环境，且节点与节点之间距离较近，ZigBee模块在工作过程中可穿透一定厚度障碍，因此信号衰减量可忽略不计。通过自组织网络协议，网络中设备之间都可以直接或间接进行无线通信，网络的可靠性和频率利用率都非常高，且ZigBee有比较完整的安全认证模式。

综上所述，选择ZigBee技术作为第三方物流智能仓储中RFID系统的数据传输网络是最合适的。

IC697ALG440

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